Contrast control device for a slit-type copier exposure system

Details Contrast control device for a slit-type copier exposure system Contrast control device for a slit-type copier exposure system

1989-03-23

1990-03-27

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2754, G03B 2772

Patent

active

049125052

ABSTRACT:
An original document exposure device utilizes a bump exposure to control contrast by reducing the contrast in a reproduction image of the original document. The bump exposure is achieved by covering a portion of the field of view of the focusing system of an exposure lamp with a diffuse reflector. A portion of the exposure light is thus diffusely reflected into the focusing system and onto the photosensitive media. The degree of bump achieved is controlled by position adjustment of the reflector.

REFERENCES:
patent: 3528737 (1970-09-01), Denner
patent: 3619055 (1971-11-01), Archer et al.
patent: 4257086 (1981-03-01), Gulliksen
patent: 4364658 (1982-12-01), Seto et al.
patent: 4387985 (1983-06-01), Magin et al.
patent: 4668081 (1987-05-01), Imamura
patent: 4682277 (1987-07-01), Yazaki

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